Do not buy a Rheem product, the water heaters don't last for more than 2 years and if you buy from the big box stores you will have to return it to the big box store you bought it from ...

Consider Energy-Saving Options Before You Need to Find a ReplacementHeat pump water heaters, like this ProTerra model from ...

The Rheem ProTerra XE50T10HS45U1 ... The first-hour rating is the amount of hot water the heater can provide during its first hour of use, based on the entire tank being at temperature.